[root@localhost tsort]# gcc -o tsort tsort.o -gstabs
tsort.o: In function `main':
tsort.o(.text+0x91): undefined reference to `__sF'
tsort.o(.text+0xfe): undefined reference to `__srget'
tsort.o(.text+0x12a): undefined reference to `___runetype'
tsort.o(.text+0x141): undefined reference to `_CurrentRuneLocale'
tsort.o(.text+0x160): undefined reference to `__srget'
tsort.o(.text+0x1aa): undefined reference to `___runetype'
tsort.o(.text+0x1c1): undefined reference to `_CurrentRuneLocale'
tsort.o(.text+0x206): undefined reference to `__srget'
tsort.o: In function `get_node':
tsort.o(.text+0x354): undefined reference to `dbopen'
tsort.o: In function `usage':
tsort.o(.text+0x761): undefined reference to `__sF'
collect2: ld returned 1 exit status
可是tsort.c里面根本就没这些函数，是需要FreeBsd的某个库吗
